Rio das Ostras weather in May
In May, Rio das Ostras sees average daytime highs of 26°C and overnight lows near 19°C, with 60 mm of rain across 9.5 wet days and about 10.9 hours of daylight. It is the 8th-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 41% of the time in May, and the air most often feels muggy.
Daylight stretches from about 11 h 12 min at the start of May to 10 h 42 min by month's end. Set against the rest of the year, May is Rio das Ostras's 4th-clearest and 10th-windiest month. For the whole year in context, see Rio das Ostras's year-round climate.
- Daytime high
- 26°
- 8th warmest
- Overnight low
- 19°
- 5th coldest
- Rainfall
- 60 mm
- 9.5 wet days
- Daylight
- 10 h 54 min
- 7:16 AM – 6:12 PM
- Cloud cover
- 50%
- 4th clearest
- Wind
- 9 km/h
- 10th windiest
- Solar energy
- 3.8 kWh/m²
- Travel score
- 6.9
- out of 10
Rio das Ostras is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Day-to-day highs hold fairly steady near 26°C through the month.
A typical May day in Rio das Ostras reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 30°C. Set against its neighbours, May runs about 2°C cooler than April and on par with June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg low (°C) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 27 | 20 |
| 2 | 27 | 20 |
| 3 | 27 | 20 |
| 4 | 27 | 20 |
| 5 | 27 | 20 |
| 6 | 27 | 20 |
| 7 | 27 | 20 |
| 8 | 27 | 20 |
| 9 | 27 | 20 |
| 10 | 27 | 20 |
| 11 | 26 | 19 |
| 12 | 26 | 19 |
| 13 | 26 | 19 |
| 14 | 26 | 19 |
| 15 | 26 | 19 |
| 16 | 26 | 19 |
| 17 | 26 | 19 |
| 18 | 26 | 19 |
| 19 | 26 | 19 |
| 20 | 26 | 19 |
| 21 | 26 | 19 |
| 22 | 26 | 19 |
| 23 | 26 | 19 |
| 24 | 26 | 19 |
| 25 | 26 | 19 |
| 26 | 26 | 19 |
| 27 | 26 | 19 |
| 28 | 26 | 19 |
| 29 | 26 | 19 |
| 30 | 26 | 18 |
| 31 | 26 | 18 |
How May really feels in Rio das Ostras
Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Rio das Ostras weather by month
How May compares with the rest of the year at a glance. May is the 8th-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 23° | 206 | 16.6 | 13.2 | 4.1 |
| Feb | 31° / 24° | 136 | 12.7 | 12.8 | 4.2 |
| Mar | 30° / 23° | 172 | 17.8 | 12.2 | 4.3 |
| Apr | 28° / 21° | 85 | 12 | 11.5 | 5.7 |
| May | 26° / 19° | 60 | 9.5 | 10.9 | 6.9 |
| Jun | 26° / 18° | 31 | 5.9 | 10.6 | 7.6 |
| Jul | 25° / 18° | 29 | 5.6 | 10.8 | 7.8 |
| Aug | 26° / 18° | 34 | 6.3 | 11.2 | 7.6 |
| Sep | 26° / 19° | 73 | 10.1 | 11.9 | 6.7 |
| Oct | 27° / 20° | 108 | 12 | 12.5 | 6.1 |
| Nov | 27° / 21° | 203 | 17.5 | 13.1 | 5.1 |
| Dec | 29° / 23° | 222 | 19 | 13.4 | 4.2 |
Cloud cover in May
The sky is clear or mostly clear about 41% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 21% of May, with mostly cloudy or overcast conditions the remaining 38%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 66 | 66 | 66 | 66 | 66 | 65 | 65 | 64 | 63 | 62 | 60 | 60 | 59 | 59 | 58 | 58 | 58 | 58 | 58 | 58 | 58 | 59 | 60 | 61 | 62 | 62 | 63 | 65 | 65 | 65 | 67 |
| Cloudier (%) | 34 | 34 | 34 | 34 | 34 | 35 | 35 | 36 | 37 | 38 | 40 | 40 | 41 | 41 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 41 | 40 | 39 | 38 | 38 | 37 | 35 | 35 | 35 | 33 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 66 | 34 |
| 2 | 66 | 34 |
| 3 | 66 | 34 |
| 4 | 66 | 34 |
| 5 | 66 | 34 |
| 6 | 65 | 35 |
| 7 | 65 | 35 |
| 8 | 64 | 36 |
| 9 | 63 | 37 |
| 10 | 62 | 38 |
| 11 | 60 | 40 |
| 12 | 60 | 40 |
| 13 | 59 | 41 |
| 14 | 59 | 41 |
| 15 | 58 | 42 |
| 16 | 58 | 42 |
| 17 | 58 | 42 |
| 18 | 58 | 42 |
| 19 | 58 | 42 |
| 20 | 58 | 42 |
| 21 | 58 | 42 |
| 22 | 59 | 41 |
| 23 | 60 | 40 |
| 24 | 61 | 39 |
| 25 | 62 | 38 |
| 26 | 62 | 38 |
| 27 | 63 | 37 |
| 28 | 65 | 35 |
| 29 | 65 | 35 |
| 30 | 65 | 35 |
| 31 | 67 | 33 |
Chance of precipitation in May
Rio das Ostras gets around 60 mm of rain over 9.5 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 31% and peaks near 33% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 30 | 30 | 29 | 28 | 27 | 26 | 26 | 25 |
| Rain chance (%) | |
|---|---|
| 1 | 33 |
| 2 | 33 |
| 3 | 33 |
| 4 | 32 |
| 5 | 32 |
| 6 | 32 |
| 7 | 32 |
| 8 | 32 |
| 9 | 32 |
| 10 | 32 |
| 11 | 33 |
| 12 | 33 |
| 13 | 33 |
| 14 | 33 |
| 15 | 33 |
| 16 | 33 |
| 17 | 33 |
| 18 | 33 |
| 19 | 33 |
| 20 | 32 |
| 21 | 32 |
| 22 | 32 |
| 23 | 31 |
| 24 | 30 |
| 25 | 30 |
| 26 | 29 |
| 27 | 28 |
| 28 | 27 |
| 29 | 26 |
| 30 | 26 |
| 31 | 25 |
Humidity in May
Most of May feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the muggy band about 48% of days. Sticky, muggy-or-worse air turns up on roughly 64% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Comfortable (%) | 3 | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 10 |
| Humid (%) | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 28 | 29 | 30 | 31 | 31 | 32 | 32 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 35 | 35 | 35 | 35 | 36 | 36 | 35 |
| Muggy (%) | 45 | 46 | 46 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 50 | 50 | 50 | 51 | 50 | 49 | 49 | 49 | 48 | 48 | 48 |
| Oppressive (%) | 34 | 31 | 29 | 27 | 26 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 14 | 13 | 12 | 11 | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 6 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 0 | 3 | 19 | 45 | 34 |
| 2 | 0 | 3 | 20 | 46 | 31 |
| 3 | 0 | 3 | 21 | 46 | 29 |
| 4 | 0 | 4 | 22 | 47 | 27 |
| 5 | 0 | 4 | 23 | 47 | 26 |
| 6 | 0 | 4 | 24 | 48 | 24 |
| 7 | 0 | 4 | 25 | 48 | 23 |
| 8 | 0 | 4 | 26 | 48 | 22 |
| 9 | 0 | 5 | 27 | 48 | 21 |
| 10 | 0 | 5 | 28 | 48 | 20 |
| 11 | 0 | 5 | 28 | 48 | 19 |
| 12 | 0 | 5 | 29 | 48 | 18 |
| 13 | 0 | 5 | 30 | 48 | 17 |
| 14 | 0 | 5 | 31 | 48 | 16 |
| 15 | 0 | 5 | 31 | 48 | 15 |
| 16 | 0 | 5 | 32 | 49 | 14 |
| 17 | 0 | 5 | 32 | 49 | 14 |
| 18 | 0 | 5 | 33 | 49 | 13 |
| 19 | 0 | 6 | 33 | 49 | 12 |
| 20 | 0 | 6 | 33 | 49 | 11 |
| 21 | 0 | 6 | 34 | 50 | 10 |
| 22 | 0 | 7 | 34 | 50 | 10 |
| 23 | 0 | 7 | 34 | 50 | 9 |
| 24 | 0 | 7 | 34 | 51 | 8 |
| 25 | 0 | 8 | 35 | 50 | 8 |
| 26 | 0 | 8 | 35 | 49 | 7 |
| 27 | 0 | 9 | 35 | 49 | 7 |
| 28 | 0 | 9 | 35 | 49 | 6 |
| 29 | 0 | 10 | 36 | 48 | 6 |
| 30 | 0 | 10 | 36 | 48 | 6 |
| 31 | 1 | 10 | 35 | 48 | 6 |
Wind in May
Winds average 9 km/h in May.
Across May, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
| 31 | 9 | calm |
Sunrise & sunset in May
Daylight runs from about 11 h 12 min at the start of May to 10 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 30 minutes over May. Sunrise moves from 7:10 AM to 7:23 AM, and sunset from 6:20 PM to 6:07 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.2 | 11.2 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.8 | 10.7 | 10.7 |
| Sunrise (AM) | 7:10 | 7:10 | 7:10 | 7:11 | 7:11 | 7:12 | 7:12 | 7:13 | 7:13 | 7:14 | 7:14 | 7:15 | 7:15 | 7:15 | 7:16 | 7:16 | 7:17 | 7:17 | 7:18 | 7:18 | 7:19 | 7:19 | 7:20 | 7:20 | 7:21 | 7:21 | 7:21 | 7:22 | 7:22 | 7:23 | 7:23 |
| Sunset (PM) | 6:20 | 6:20 | 6:19 | 6:18 | 6:18 | 6:17 | 6:16 | 6:16 | 6:15 | 6:15 | 6:14 | 6:14 | 6:13 | 6:13 | 6:12 | 6:12 | 6:11 | 6:11 | 6:10 | 6:10 | 6:10 | 6:09 | 6:09 | 6:09 | 6:08 | 6:08 | 6:08 | 6:08 | 6:08 | 6:07 | 6:07 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.2 | 7:10 | 6:20 |
| 2 | 11.2 | 7:10 | 6:20 |
| 3 | 11.1 | 7:10 | 6:19 |
| 4 | 11.1 | 7:11 | 6:18 |
| 5 | 11.1 | 7:11 | 6:18 |
| 6 | 11.1 | 7:12 | 6:17 |
| 7 | 11.1 | 7:12 | 6:16 |
| 8 | 11.1 | 7:13 | 6:16 |
| 9 | 11.0 | 7:13 | 6:15 |
| 10 | 11.0 | 7:14 | 6:15 |
| 11 | 11.0 | 7:14 | 6:14 |
| 12 | 11.0 | 7:15 | 6:14 |
| 13 | 11.0 | 7:15 | 6:13 |
| 14 | 11.0 | 7:15 | 6:13 |
| 15 | 10.9 | 7:16 | 6:12 |
| 16 | 10.9 | 7:16 | 6:12 |
| 17 | 10.9 | 7:17 | 6:11 |
| 18 | 10.9 | 7:17 | 6:11 |
| 19 | 10.9 | 7:18 | 6:10 |
| 20 | 10.9 | 7:18 | 6:10 |
| 21 | 10.9 | 7:19 | 6:10 |
| 22 | 10.8 | 7:19 | 6:09 |
| 23 | 10.8 | 7:20 | 6:09 |
| 24 | 10.8 | 7:20 | 6:09 |
| 25 | 10.8 | 7:21 | 6:08 |
| 26 | 10.8 | 7:21 | 6:08 |
| 27 | 10.8 | 7:21 | 6:08 |
| 28 | 10.8 | 7:22 | 6:08 |
| 29 | 10.8 | 7:22 | 6:08 |
| 30 | 10.7 | 7:23 | 6:07 |
| 31 | 10.7 | 7:23 | 6:07 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 3.8 kWh/m².
For context, solar energy here swings from a low near 3.54 kWh/m² to a high of 6.31 kWh/m² in February across the year — May's 3.8 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.9 | 3.8 | 3.8 | 3.8 | 3.7 | 3.7 | 3.7 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.2 | Bright |
| 2 | 4.2 | Bright |
| 3 | 4.2 | Bright |
| 4 | 4.2 | Bright |
| 5 | 4.1 | Bright |
| 6 | 4.1 | Bright |
| 7 | 4.0 | Bright |
| 8 | 4.0 | Bright |
| 9 | 4.0 | Moderate |
| 10 | 3.9 | Moderate |
| 11 | 3.9 | Moderate |
| 12 | 3.9 | Moderate |
| 13 | 3.8 | Moderate |
| 14 | 3.8 | Moderate |
| 15 | 3.8 | Moderate |
| 16 | 3.7 | Moderate |
| 17 | 3.7 | Moderate |
| 18 | 3.7 | Moderate |
| 19 | 3.6 | Moderate |
| 20 | 3.6 | Moderate |
| 21 | 3.6 | Moderate |
| 22 | 3.6 | Moderate |
| 23 | 3.6 | Moderate |
| 24 | 3.6 | Moderate |
| 25 | 3.6 | Moderate |
| 26 | 3.6 | Moderate |
| 27 | 3.6 | Moderate |
| 28 | 3.6 | Moderate |
| 29 | 3.6 | Moderate |
| 30 | 3.6 | Moderate |
| 31 | 3.6 | Moderate |
Hazard calendar for Rio das Ostras
None of Rio das Ostras's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Rio das Ostras's rainy season runs October–March, when most of the year's rain falls.
Is May a good time to visit Rio das Ostras?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Rio das Ostras for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Rio das Ostras in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Rio das Ostras sees daytime highs around 26°C and nights near 19°C. Worth packing: light clothes and rain gear. About 10 days see rain.
Sea temperature near Rio das Ostras in May
The nearest coast averages about 24°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 km away) is warmest in March at about 25°C and coldest in September near 21°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 24 | 24 | 25 | 25 | 24 | 23 | 22 | 22 | 21 | 22 | 22 | 24 |
| Comfort | Refreshing | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Refreshing |
| Feb | 24 | Warm |
| Mar | 25 | Warm |
| Apr | 25 | Warm |
| May | 24 | Refreshing |
| Jun | 23 | Refreshing |
| Jul | 22 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 22 | Refreshing |
| Dec | 24 | Refreshing |
UV index in Rio das Ostras in May
Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Rio das Ostras peaks around January 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 14 | 14 | 13 | 9 | 7 | 6 | 6 | 8 | 8 | 12 | 14 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 14 | Extreme |
| Mar | 13 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 8 | Very high |
| Sep | 8 | Very high |
| Oct | 12 | Extreme |
| Nov | 14 | Extreme |
| Dec | 14 | Extreme |
Where is Rio das Ostras?
Rio das Ostras sits at 22.5°S, 41.9°W, 11 m above sea level, in Brazil. The nearest listed city is Macaé, 23 km away.
Topography around Rio das Ostras
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rio das Ostras.
Within 3 km, the terrain around Rio das Ostras has only modest variations in elevation — a maximum elevation change of 49 m around an average of 4 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 693 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,215 m.
The land around Rio das Ostras is covered by water (39%) and artificial surfaces (32%) within 3 km, water (45%) and grassland (27%) within 16 km, and water (37%), trees (31%) and grassland (28%) within 80 km.
Brazil travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / N
- 127 / 220 V · 60 Hz
- Prices
- ≈ 46% of US
- price level, 2025
- GDP per capita
- $10,713
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 89%
- of population, 2024
- Homicide rate
- 19.3
- per 100k, 2023
- Road deaths
- 16
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 482
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Rio das Ostras (-22.5269°, -41.945°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).